We linked this by Gelinas yesterday: A man’s home is the government’s castle
Also, American Thinker's Seizing the Wealth of Landlords, One District at a Time
Both cities' rent control laws began as emergencies to meet temporary housing crunches (you always need a "crisis" to create an opportunity for government control). Then your "emergency" action becomes permanent due to its newly-created constituency. That is how Leviathan grows.
If rent control were eliminated in NYC today, in short time there would be tons of new middle class rental housing built; supply up, prices down. The moral issue, though, is that these controls do constitute a form of government theft from the owners.